python opencv通过按键采集图片源码

'''
“N”  新建文件夹 data/  用来存储图像
"S"开始采集图像，将采集到的图像放到 data/ 路径下
“Q”退出窗口
'''
import numpy as np  # 数据处理的库 Numpy
import cv2 # 图像处理的库 OpenCv
import os  # 读写文件
import shutil # 读写文件
from PIL import Image, ImageDraw, ImageFont

# # OpenCv 调用摄像头 / Use camera
cap = cv2.VideoCapture(0)
cap.set(cv2.CAP_PROP_FRAME_WIDTH,1920)
cap.set(cv2.CAP_PROP_FRAME_HEIGHT,1080)
'''
#功能函数，只是用来往图片中显示汉字
#示例 img = cv2ImgAddText(cv2.imread('img1.jpg'), "大家好，我是片天边的云彩", 10, 65, (0, 0, 139), 20)
参数说明：
img：OpenCV图片格式的图片
text：要写入的汉字
left：字符坐标x值
top：字符坐标y值
textColor：字体颜色
：textSize：字体大小
'''
def cv2ImgAddText(img, text, left, top, textColor=(0, 255, 0), textSize=20):
 if (isinstance(img, np.ndarray)):  # 判断是否OpenCV图片类型
  img = Image.fromarray(cv2.cvtColor(img, cv2.COLOR_BGR2RGB))
 # 创建一个可以在给定图像上绘图的对象
 draw = ImageDraw.Draw(img)
 # 字体的格式
 fontStyle = ImageFont.truetype(
  "font/simsun.ttc", textSize, encoding="utf-8")
 # 绘制文本
 draw.text((left, top), text, textColor, font=fontStyle)
 # 转换回OpenCV格式
 return cv2.cvtColor(np.asarray(img), cv2.COLOR_RGB2BGR)
# 存储图像的文件夹 
current_dir = ""
# 保存  图像 的路径 
path_photos_from_camera = "data/"
press_n_flag = 0
cnt_ss=0

while cap.isOpened():
 flag, img_rd = cap.read()
 #print(img_rd.shape)
 kk = cv2.waitKey(2)
 # 待会要写的字体 / Font to write
 font = cv2.FONT_ITALIC
 # 4. 按下 'n' 新建存储人脸的文件夹 / press 'n' to create the folders for saving faces
 if kk == ord('N') or kk == ord('n'):
  current_dir = path_photos_from_camera
  #os.makedirs(current_dir)
  if os.path.isdir(current_dir):
pass
  else:
os.mkdir(current_dir)
  print('\n')
  print("新建的保存图像的文件夹 / Create folders: ", current_dir)
  press_n_flag = 1  # 已经按下 'n' / have pressed 'n'

 # 5. 按下 's' 保存摄像头中的图像到本地 / Press 's' to save image into local images
 if kk == ord('S') or kk == ord('s'):
  # 检查有没有先按'n'新建文件夹 / check if you have pressed 'n'
  if press_n_flag:
cnt_ss += 1
cv2.imwrite(current_dir + "/img_" + str(cnt_ss) + ".jpg", img_rd)
print("写入本地 / Save into：", str(current_dir) + "/img_face_" + str(cnt_ss) + ".jpg")
  else:
print("请在按 'S' 之前先按 'N' 来建文件夹 / Please press 'N' before 'S'")

 # 添加说明 / Add some statements
 #cv2.putText(img_rd, "Face Register", (20, 40), font, 1, (0, 255, 0), 1, cv2.LINE_AA)
 img_rd = cv2ImgAddText(img_rd, "图片采集系统", 160, 25, (0, 255,0), 30)
 #cv2.putText(img_rd, "N: Create face folder", (20, 350), font, 0.8, (0, 255, 0), 1, cv2.LINE_AA)
 img_rd = cv2ImgAddText(img_rd, "N: 创建保存图像文件夹", 20, 350, (0, 255, 0), 20)
 #cv2.putText(img_rd, "S: Save current face", (20, 400), font, 0.8, (0, 255, 0), 1, cv2.LINE_AA)
 img_rd = cv2ImgAddText(img_rd, "S: 保存当前图片", 20, 400, (0, 255, 0), 20)
 #cv2.putText(img_rd, "Q: Quit", (20, 450), font, 0.8, (0, 0, 0), 1, cv2.LINE_AA)
 img_rd = cv2ImgAddText(img_rd, "Q: 退出", 20, 450, (0, 255, 0), 20)
 # 6. 按下 'Q' 键退出 / Press 'q' to exit
 if kk == ord('Q') or kk == ord('q'):
  break
 # 如果需要摄像头窗口大小可调 / Uncomment this line if you want the camera window is resizeable
 cv2.namedWindow("camera", 0)
 cv2.imshow("camera", img_rd)
# 释放摄像头 / Release camera and destroy all windows
cap.release()
cv2.destroyAllWindows()

pip install pillow

sudo apt-get install python3-pillow

/*****************************************************
2021.5.18:按键采集图像
******************************************************/
#include "opencv2/core/core.hpp" 
#include "opencv2/imgproc/imgproc.hpp" 
#include "opencv2/calib3d/calib3d.hpp" 
#include "opencv2/highgui/highgui.hpp" 
#include <iostream> 
#include <fstream> 
using namespace cv;
using namespace std;
#define SRC_WIDTH  1920
#define SRC_HEIGHT 1080
int main()
{
	//测试视频
	VideoCapture capture;
	capture.open(1);
	//capture.open("v4l2src device=/dev/video4 ! video/x-raw,width=1920,height=1020,framerate=30/1 ! videoconvert ! appsink");
	if (!capture.isOpened())
	{
		printf("文件打开失败");
	}
	capture.set(CAP_PROP_FRAME_WIDTH, SRC_WIDTH);  //设置宽度
	capture.set(CAP_PROP_FRAME_HEIGHT, SRC_HEIGHT);  //设置长度
	Mat frame;
	int n = 0;
	char* cstr = new char[120];
	while (true)
	{
		
		capture >> frame;
		if (frame.data == NULL)
		{
			printf("Image is empty\n");
			//writer.write(frame);
			break;
			//continue;
		}
		char kk=waitKey(2);
		if (kk == 'S' || kk == 's')
		{
			sprintf(cstr, "%s%d%s", "caliberation/", n++, ".jpg");
			imwrite(cstr, frame);
			printf("保存了图片\n");
		}
		
		namedWindow("111", 0);//参数为零，则可以自由拖动
		imshow("111", frame);
		waitKey(2);
	}
	return 0;
}